The structural system of T11-12 building in Rainbow Lot 9 is frame-supported shearwall. With Performance-based design method, it can be proved that the strength and ductility of structure were favorable. According to the result of Pushover analysis, the ductility design was adopted for the shearwall above transfer story. By the above work, it is showed that seismic performance objectives and yield mechanism should be considered correctly, and the structure should be balanced between strength and ductility.